Refinishing tool for switch contact rods



Oct. 12 1926.

A. KNIERIM REFINISHING TOOL FOR SWITCH CONTACT-RODS.

Filed April 8, 1924 Inventor: Andrew Knierim,

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His Attorney Patented Oct. 12, 1926.

ANDREW KNIERIM,

EEEINIsHINe TooL FOR SWITCH CONTACT Eons.

Application filed April 8,

, ening or refinishing the ends of the Contact rods. of fluid break switches.

5 operating conditions these rods sometimes become burned at their ends with the result that the roughened surface interferes with the entry of the rod into the corresponding socket contact. 'By the use of the tool disclosed hereinthe ends of these rods may be readily refinished with a smooth surface of the proper curvature.

My invention will be better understood by reference to the accompanying specification and drawing and its scope will be pointed out in the appended claims.

In the drawing, Fig. 1 is a perspective view of the complete tool comprising my invention; Fig. 2 is a disassembled view of the parts comprising the tool; and Fig. 3 is a fragmentary sectional view of the tool showing also the end portion of a burned contact rod.

consists of three parts, the body 1. the cap 2, and the cutting blade 3. The body is in the form of a hollow cylinder, the opening of which is of such a size'as to freely receive the switch contact rod 4. The upper end of the body has an exterior right-handed'screw thread and the cap is interiorly threaded whereby theyare secured together. Two opposite longitudinal slots 5 are provided in the upper end of the body, which slots receive the cutting blade and the ends of these slots constitute .limiting surfaces 6 against which the lower end of the. cutting blade is clamped. The blade 3 which may be of steel has two oppositely beveled cutting faces 7 shaped to produce the desired curvature on the end of the contact rod 4. The opposite end of the blade is shown somewhat pointed to conform to the conical innersurface 8 of the cap. For rotating the tool the'capis pro Under severe Referring now to the drawing, the toolv 1924. Serial No. 705,110.

limited to the particular form shown and, dc

scribed as it will be'apparent that many modlfications therein may be made without departing from the scope of my invention as i set forth in the appended claims.

What I 'claimasncw and desire to secure by Letters Patent of the United States, is 1. A device of the character described comprising a tubular body member having longitudinal slots formed therein at one end, a

oEsCHEN CTADY, NEW YORK, ,AssIeNoE To GENERAL ELECTRIC COMPANY, A CoRPoEA IoN OF NEW YORK.

transverse removable blade engaging in'sa id slots and having a cutting notch at one end,

and a cap screw threaded'on the end of the l tubular body member for engaging opposite edges of the blade tocenter the same in the body and for engaging the'end of the blade to firmly clamp itto the body.

2. A itool of the character described com prising a tubularbody member having its walls at one end slotted longitudinally, a cut ting blade having beveled cutting edges formed at one end thereof and having its side edges engaging. in the-slots in said body member, and a cap screw-threaded on the slotted end. of said body member whereby said blade is firmly clamped to said body member, said cap having a shank terminating in a polygonal portion by which the tool may be rotated. V i In witness whereof, I have hereunto set'my hand this 7th day of April, 1924.

' ANDREW KNIERIM. 

